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. 2020 Jan 28;11:549. doi: 10.1038/s41467-019-14142-w

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 3 — a Demodulated amplitude averaged over $300 \times 300$ pixels plotted as a function of frequency detuning $Δ f = f - f_{d}$ with steps of 0.12 Hz for $f = 5$ kHz and 2 s exposure time (left); $f = 5$ kHz and 250 ms exposure time (center); $f = 100$ kHz and 2 s exposure time (right). b FWHM of the demodulation efficiency scales as the inverse exposure time. c Uniformity maps of the frequency selectivity (FWHM of the demodulated intensity as a function of $Δ f$ ) over the entire FOV ( $8 \times 8$ pixels binning).